Abundance:
* Profusion: Implies an overflowing, lavish amount.
* Opulence: Suggests wealth and luxury.
* Bountiful: Conveys a generous and ample supply.
* Plenteous: Similar to bountiful but with a more formal tone.
* Overabundance: Emphasizes a surplus.
Simplicity & Naturalness:
* Fullness: Focuses on being complete and satisfied.
* Richness: Implies abundance of quality or substance.
* Store: Suggests something that is kept for later use.
* Harvest: Connotes the result of hard work and nature's bounty.
More Specific:
* Wondrous: Emphasizes the wonder and beauty of plenty.
* Heaping: Refers to a large amount, piled high.
* Overflowing: Suggests something that is full to the point of spilling.
* Vast: Conveys immense scale and quantity.
Figurative:
* A cornucopia: A symbol of abundance and plenty.
* A feast for the eyes: Used metaphorically for something visually pleasing and plentiful.
Ultimately, the best poetic word for plenty is the one that best fits your specific poem and its intended meaning.